I just went and measured my roost and dropping board. The dropping board is at 2' and the roost at 3', so they can use the edge of the dropping board as a "ladder". Maybe when they get older I will add one. I don't think there is any real advantage to putting the roosts up higher, as long as they are higher than the nest box. ANd you MUST have a dropping board, it will keep everything sooo much more poop free! If you are worried about room, run 2 roosts side by side along with 10' wall, with a wider dropping board. Ridgerunner has good measurements.